Bug 1491224 - (CVE-2017-12154) CVE-2017-12154 Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 register
CVE-2017-12154 Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 regi...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20170912,repo...
: Security
Depends On: 1491225 1491231 1491232 1491233
Blocks: 1488027
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Reported: 2017-09-13 07:11 EDT by Prasad J Pandit
Modified: 2018-07-19 02:34 EDT (History)
45 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Linux kernel built with the KVM visualization support (CONFIG_KVM), with nested visualization (nVMX) feature enabled (nested=1), is vulnerable to a crash due to disabled external interrupts. As L2 guest could access (r/w) hardware CR8 register of the host(L0). In a nested visualization setup, L2 guest user could use this flaw to potentially crash the host(L0) resulting in DoS.
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0676 None None None 2018-04-10 04:07 EDT
Red Hat Product Errata RHSA-2018:1062 None None None 2018-04-10 05:31 EDT

  None (edit)
Description Prasad J Pandit 2017-09-13 07:11:28 EDT
Linux kernel built with the KVM virtualisation support(CONFIG_KVM),
with nested virtualisation(nVMX) feature enabled(nested=1), is vulnerable
to a crash due to disabled external interrupts. As L2 guest could access(r/w)
hardware CR8 register of the host(L0).

In a nested virtualisation setup, L2 guest user could use this flaw
to potentially crash the host(L0) resulting in DoS.

Upstream patch
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   -> https://git.kernel.org/linus/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f

Reference:
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   -> http://www.openwall.com/lists/oss-security/2017/09/26/3
Comment 1 Prasad J Pandit 2017-09-13 07:12:54 EDT
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1491225]
Comment 2 Prasad J Pandit 2017-09-13 07:24:55 EDT
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1491231]
Comment 4 Prasad J Pandit 2017-09-13 07:49:31 EDT
Statement:

This issue does not affect the versions of the kernel package as shipped with
Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
Comment 5 Prasad J Pandit 2017-09-13 15:09:29 EDT
Acknowledgments:

Name: Jim Mattson (Google.com)
Comment 7 Justin M. Forbes 2018-01-29 11:34:34 EST
This was fixed for Fedora with the 4.13.5 stable updates
Comment 8 errata-xmlrpc 2018-04-10 04:07:04 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0676 https://access.redhat.com/errata/RHSA-2018:0676
Comment 9 errata-xmlrpc 2018-04-10 05:30:41 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:1062 https://access.redhat.com/errata/RHSA-2018:1062

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